code: def test_infer_schema_only_multilinestrings():
      df = GeoDataFrame(geometry=[MultiLineString(city_hall_walls)])
  
      assert infer_schema(df) == {
          "geometry": "MultiLineString",
          "properties": OrderedDict(),
      }
  
imports: from collections import OrderedDict
  from shapely.geometry import LineString, MultiLineString, MultiPoint, MultiPolygon, Point, Polygon
  import pandas
  import pytest
  import numpy
  from geopandas import GeoDataFrame
  from geopandas.io.file import infer_schema
label_desc: Use image node_id 6 for calling a global function with example usage: test_infer_schema_only_multilinestrings() without return types